Function checkResumeConsistency

src/utils/sessionStorage.ts:2384–2403

(chain: Message[])

 * /share or log-listing chain rebuilds.
 */
export function checkResumeConsistency(chain: Message[]): void {
  for (let i = chain.length - 1; i >= 0; i--) {
    const m = chain[i]!
    if (m.type !== 'system' || m.subtype !== 'turn_duration') continue
    const expected = m.messageCount
    if (expected === undefined) return
    // `i` is the 0-based index of the checkpoint in the reconstructed chain.
    // The checkpoint was appended AFTER messageCount messages, so its own
    // position should be messageCount (i.e., i === expected).
    const actual = i
    logEvent('ncode_resume_consistency_delta', {
      expected,
      actual,
      delta: actual - expected,
      chain_length: chain.length,
      checkpoint_age_entries: chain.length - 1 - i,
    })
    return
  }
}

/**
 * Builds a filie history snapshot chain from the conversation